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介绍了一种检测小工件平行度和垂直度的新方法。利用反射棱镜将常规的问接测量变为直接测量，使测量不受外部环境的影响，方便、快速、准确，文章还对测量误差作了分折，并提出了消除误差的方法。
A new method to detect the parallelism and verticality of small workpieces is introduced. The use of reflective prism will be a direct measurement of the measured changes to direct measurement, the measurement from the impact of the external environment, convenient, fast and accurate, the article also made a measurement error of the error, and put forward the method to eliminate the error.